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- /* Copyright (C) 2017-2022 Free Software Foundation, Inc.
- Contributed by ARM Ltd.
- This file is part of GCC.
- GCC is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 3, or (at your option) any later
- version.
- GCC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
- Under Section 7 of GPL version 3, you are granted additional
- permissions described in the GCC Runtime Library Exception, version
- 3.1, as published by the Free Software Foundation.
- You should have received a copy of the GNU General Public License and
- a copy of the GCC Runtime Library Exception along with this program;
- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- <http://www.gnu.org/licenses/>. */
- #if !defined (AARCH64_UNWIND_H) && !defined (__ILP32__)
- #define AARCH64_UNWIND_H
- #define DWARF_REGNUM_AARCH64_RA_STATE 34
- #define MD_DEMANGLE_RETURN_ADDR(context, fs, addr) \
- aarch64_demangle_return_addr (context, fs, addr)
- #define MD_FROB_UPDATE_CONTEXT(context, fs) \
- aarch64_frob_update_context (context, fs)
- static inline int
- aarch64_cie_signed_with_b_key (struct _Unwind_Context *context)
- {
- const struct dwarf_fde *fde = _Unwind_Find_FDE (context->bases.func,
- &context->bases);
- if (fde != NULL)
- {
- const struct dwarf_cie *cie = get_cie (fde);
- if (cie != NULL)
- {
- char *aug_str = cie->augmentation;
- return strchr (aug_str, 'B') == NULL ? 0 : 1;
- }
- }
- return 0;
- }
- /* Do AArch64 private extraction on ADDR_WORD based on context info CONTEXT and
- unwind frame info FS. If ADDR_WORD is signed, we do address authentication
- on it using CFA of current frame. */
- static inline void *
- aarch64_demangle_return_addr (struct _Unwind_Context *context,
- _Unwind_FrameState *fs ATTRIBUTE_UNUSED,
- _Unwind_Word addr_word)
- {
- void *addr = (void *)addr_word;
- if (context->flags & RA_SIGNED_BIT)
- {
- _Unwind_Word salt = (_Unwind_Word) context->cfa;
- if (aarch64_cie_signed_with_b_key (context) != 0)
- return __builtin_aarch64_autib1716 (addr, salt);
- return __builtin_aarch64_autia1716 (addr, salt);
- }
- else
- return addr;
- }
- /* Do AArch64 private initialization on CONTEXT based on frame info FS. Mark
- CONTEXT as return address signed if bit 0 of DWARF_REGNUM_AARCH64_RA_STATE is
- set. */
- static inline void
- aarch64_frob_update_context (struct _Unwind_Context *context,
- _Unwind_FrameState *fs)
- {
- if (fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset & 0x1)
- /* The flag is used for re-authenticating EH handler's address. */
- context->flags |= RA_SIGNED_BIT;
- else
- context->flags &= ~RA_SIGNED_BIT;
- return;
- }
- #endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */
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